This is a frame for a 30mm filter mat.
Filter dimensions are 50cm height and 20cm diameter.
The needed mat size is about 50x60cm.
The parts are printed in PETG and glued together with hot glue.
OpenSCAD files attached.
A smaller version for a 50x50cm filter mat is also available:
https://www.printables.com/model/1031582-hamburger-mattenfilter-frame-170mm-diameter
Have Fun!
The author marked this model as their own original creation.